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393w exhaust 2.5 or 3"?
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<table border="0" cellpadding="1" cellspacing="1" width="99%" align="center"> <tr bgcolor="#000000"><td> <table border="0" width="100%" cellpadding="3" cellspacing="0"> <tr bgcolor="#000099"> <td colspan="2" align="left"> <font size="2" color="#ffffff" face="Verdana, Arial"> <b>T O P I C R E V I E W</b> </font></td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>4MY8TERS</b> <br /><small>Member # 7840</small> </font></td> <td width="82%"> <font size="1" face="Verdana, Arial"> <img src="https://californiafords.com/ubb/posticon.gif" border="0" alt=" - " /> posted <script language="JavaScript1.3" type="text/javascript"> document.writeln(timestamp(new Date(2013,6,17,16,37,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> I know 3" would be best since I'm going blown, but how about the clearance issues over the rear end? <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>racsirx</b> <br /><small>Member # 1710</small> </font></td> <td width="82%"> <font size="1" face="Verdana, Arial"> <img src="https://californiafords.com/ubb/posticon.gif" border="0" alt=" - " /> posted <script language="JavaScript1.3" type="text/javascript"> document.writeln(timestamp(new Date(2013,6,17,17,44,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> Yes 3" would the best, I got my 3" catback from Flowmaster <br /> </font> </td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>Secnd2nun64</b> <br /><small>Member # 1431</small> </font></td> <td width="82%"> <font size="1" face="Verdana, Arial"> <img src="https://californiafords.com/ubb/posticon.gif" border="0" alt=" - " /> posted <script language="JavaScript1.3" type="text/javascript"> document.writeln(timestamp(new Date(2013,6,17,21,16,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> 2.5 will be fine if that's what you already got. I wouldn't go out and buy new exhaust to just to go to 3", not worth the investment. <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>racsirx</b> <br /><small>Member # 1710</small> </font></td> <td width="82%"> <font size="1" face="Verdana, Arial"> <img src="https://californiafords.com/ubb/posticon.gif" border="0" alt=" - " /> posted <script language="JavaScript1.3" type="text/javascript"> document.writeln(timestamp(new Date(2013,6,17,22,41,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> </font><blockquote><font size="1" face="Verdana, Arial">quote:</font><hr /><font size="2" face="Verdana, Arial">Originally posted by Secnd2nun64:<br /><strong> 2.5 will be fine if that's what you already got. I wouldn't go out and buy new exhaust to just to go to 3", not worth the investment. </strong></font><hr /></blockquote><font size="2" face="Verdana, Arial">A blown 393 needs to breathe, 2.5" will hold it back. <br /> </font> </td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>Secnd2nun64</b> <br /><small>Member # 1431</small> </font></td> <td width="82%"> <font size="1" face="Verdana, Arial"> <img src="https://californiafords.com/ubb/posticon.gif" border="0" alt=" - " /> posted <script language="JavaScript1.3" type="text/javascript"> document.writeln(timestamp(new Date(2013,6,18,6,31,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> </font><blockquote><font size="1" face="Verdana, Arial">quote:</font><hr /><font size="2" face="Verdana, Arial">Originally posted by racsirx:<br /><strong> </font><blockquote><font size="1" face="Verdana, Arial">quote:</font><hr /><font size="2" face="Verdana, Arial">Originally posted by Secnd2nun64:<br /><strong> 2.5 will be fine if that's what you already got. I wouldn't go out and buy new exhaust to just to go to 3", not worth the investment. </strong></font><hr /></blockquote><font size="2" face="Verdana, Arial">A blown 393 needs to breathe, 2.5" will hold it back. </strong></font><hr /></blockquote><font size="2" face="Verdana, Arial">Not saying that it wouldn't. I'm saying the gain is not worth the investment if you already have 2.5 pipes. The 2.5 can handle 500hp. Going to 3" may pick up 15-20 hp. It really depends on if the builder is looking to get every little bit out of the combo, but if so why not do a 427w? <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>racsirx</b> <br /><small>Member # 1710</small> </font></td> <td width="82%"> <font size="1" face="Verdana, Arial"> <img src="https://californiafords.com/ubb/posticon.gif" border="0" alt=" - " /> posted <script language="JavaScript1.3" type="text/javascript"> document.writeln(timestamp(new Date(2013,6,18,8,14,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> I have seen bigger gains with a 302 HCI with a S-trim when switching over to 3" <br /> </font> </td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>turbo50</b> <br /><small>Member # 6700</small> </font></td> <td width="82%"> <font size="1" face="Verdana, Arial"> <img src="https://californiafords.com/ubb/posticon.gif" border="0" alt=" - " /> posted <script language="JavaScript1.3" type="text/javascript"> document.writeln(timestamp(new Date(2013,6,18,8,30,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> We seen gains on the naturally aspirated 393 when going back to smaller header 1 5/8 and 3 inch exhaust versus larger 1 3/4 header and 3 inch exhaust. Never got to test it with 2.5 but maybe the new owner will. <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>Boss 327</b> <br /><small>Member # 9143</small> </font></td> <td width="82%"> <font size="1" face="Verdana, Arial"> <img src="https://californiafords.com/ubb/posticon.gif" border="0" alt=" - " /> posted <script language="JavaScript1.3" type="text/javascript"> document.writeln(timestamp(new Date(2013,6,18,14,45,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> </font><blockquote><font size="1" face="Verdana, Arial">quote:</font><hr /><font size="2" face="Verdana, Arial">Originally posted by turbo50:<br /><strong> We seen gains on the naturally aspirated 393 when going back to smaller header 1 5/8 and 3 inch exhaust versus larger 1 3/4 header and 3 inch exhaust. Never got to test it with 2.5 but maybe the new owner will. </strong></font><hr /></blockquote><font size="2" face="Verdana, Arial">Why do you think that is? <br /> </font> </td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>Notch1320</b> <br /><small>Member # 2647</small> </font></td> <td width="82%"> <font size="1" face="Verdana, Arial"> <img src="https://californiafords.com/ubb/posticon.gif" border="0" alt=" - " /> posted <script language="JavaScript1.3" type="text/javascript"> document.writeln(timestamp(new Date(2013,6,18,15,56,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> The header is key on a max effort deal. There is a reason good headers cost so much! Finding the right stepped header/ collector combo for my car made some good gains. I would go 3" on your car though for the exhaust. <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>warhorse58gt</b> <br /><small>Member # 7702</small> </font></td> <td width="82%"> <font size="1" face="Verdana, Arial"> <img src="https://californiafords.com/ubb/posticon.gif" border="0" alt=" - " /> posted <script language="JavaScript1.3" type="text/javascript"> document.writeln(timestamp(new Date(2013,6,18,18,28,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> Go 3" I have went 9.76 on shorties and 2 1/2 exhaust. I added 135lbs, when I added the long tubes & 3" exhaust. Car still picked up a full .10 and 2 mph. So it was worth at least .2 & 2mph with the extra weight. To me that is worth the money to do. <br /> </font> </td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>Secnd2nun64</b> <br /><small>Member # 1431</small> </font></td> <td width="82%"> <font size="1" face="Verdana, Arial"> <img src="https://californiafords.com/ubb/posticon.gif" border="0" alt=" - " /> posted <script language="JavaScript1.3" type="text/javascript"> document.writeln(timestamp(new Date(2013,6,18,18,55,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> </font><blockquote><font size="1" face="Verdana, Arial">quote:</font><hr /><font size="2" face="Verdana, Arial">Originally posted by warhorse58gt:<br /><strong> Go 3" I have went 9.76 on shorties and 2 1/2 exhaust. I added 135lbs, when I added the long tubes & 3" exhaust. Car still picked up a full .10 and 2 mph. So it was worth at least .2 & 2mph with the extra weight. To me that is worth the money to do. </strong></font><hr /></blockquote><font size="2" face="Verdana, Arial">Did you change mufflers too? I asked a lot of people and researched when I had my exhaust redone for my 393w and was told to keep the 2.5. Got me wondering if I should change mine out now. lol <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>racsirx</b> <br /><small>Member # 1710</small> </font></td> <td width="82%"> <font size="1" face="Verdana, Arial"> <img src="https://californiafords.com/ubb/posticon.gif" border="0" alt=" - " /> posted <script language="JavaScript1.3" type="text/javascript"> document.writeln(timestamp(new Date(2013,6,18,19,28,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> I can't remember exact numbers but Forced331 saw a difference<br /><br /><a href="http://californiafords.com/cgi-bin/ultimatebb.cgi?ubb=get_topic;f=1;t=052358" target="_blank">http://californiafords.com/cgi-bin/ultimatebb.cgi?ubb=get_topic;f=1;t=052358</a> <br /> </font> </td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>warhorse58gt</b> <br /><small>Member # 7702</small> </font></td> <td width="82%"> <font size="1" face="Verdana, Arial"> <img src="https://californiafords.com/ubb/posticon.gif" border="0" alt=" - " /> posted <script language="JavaScript1.3" type="text/javascript"> document.writeln(timestamp(new Date(2013,6,18,21,32,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> </font><blockquote><font size="1" face="Verdana, Arial">quote:</font><hr /><font size="2" face="Verdana, Arial">Originally posted by Secnd2nun64:<br /><strong> </font><blockquote><font size="1" face="Verdana, Arial">quote:</font><hr /><font size="2" face="Verdana, Arial">Originally posted by warhorse58gt:<br /><strong> Go 3" I have went 9.76 on shorties and 2 1/2 exhaust. I added 135lbs, when I added the long tubes & 3" exhaust. Car still picked up a full .10 and 2 mph. So it was worth at least .2 & 2mph with the extra weight. To me that is worth the money to do. </strong></font><hr /></blockquote><font size="2" face="Verdana, Arial">Did you change mufflers too? I asked a lot of people and researched when I had my exhaust redone for my 393w and was told to keep the 2.5. Got me wondering if I should change mine out now. lol </strong></font><hr /></blockquote><font size="2" face="Verdana, Arial">I had the shorties then a x-pipe, with 12" race bullets. With the long tubes I have 1 7/8 kooks header with a 3" collector to x-pipe, Then in to borla xs 2 mufflers. I got them dumped after the mufflers. I would like to have it all the way out to the back of the car. But I ave a weld in sway bar, that keeps me for being able to do that. <img border="0" title="" alt="[Frown]" src="frown.gif" /><br /> <br /> <small>[ 2013-07-18, 09:34 PM: Message edited by: warhorse58gt ]</small> <br /> </font> </td></tr> </table></td></tr></table> <br /> <br />
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